Pseudocode memajukan kata/huruf

/* input : JAMES maju 13 alfabet
output : WMZRF */

START
input kata
x = 0
y = 0
DOWHILE x < lengthofstring(kata)
DOWHILE y < 13
kata[x] = kata[x] + 1
IF kata[x] = 91 THEN
kata[x] = 65
ENDIF
y = y + 1
ENDDO
print kata[x]
x = x + 1
ENDDO
END